To me, they’re all babies whether they are newborns, crawlers, or toddlers. “Babies” until they are around 3 years old and can no longer be called a toddler. They are even called “preschoolers” at that time.
In fact, once they reach around 3 years old, they will also start telling you that they are no longer babies. It upsets them because now they are a BIG girl or BIG boy. As adults, we just smile and keep it to ourselves for now….until we let it slip out again.